President Obama and his supporters have done a terrific job of framing the debate over the Iran nuclear agreement as a choice between taking the deal or opting for war. They continually challenge critics to articulate an alternative to the deal, claiming that there isn’t one. This is a superb debating technique, and it has put critics on the defensive. But it is a false dichotomy. The choice might conceivably be between a deal and war, although that is by no means certain — the Cold...